class MyClass
attr_accessor :name, :unit_price
def initialize(name, unit_price)
@name, @unit_price = name, unit_price
end
def price(quantity=1)
@unit_price * quantity
end
# Make MyClass#cost an alias for MyClass#price
alias :cost :price
# The attr_accessor decorator created two methods called "unit_price" and
# "unit_price=". I'll create aliases for those methods as well.
alias :unit_cost :unit_price
alias :unit_cost= :unit_price=
end
bacon = MyClass.new("Bacon", 3.95)
bacon.price(100) # => 395.0
bacon.cost(100) # => 395.0
bacon.unit_price # => 3.95
bacon.unit_cost # => 3.95
bacon.unit_cost = 3.99
bacon.cost(100) # => 399.0